The modem scripts for Nokia phones (Nokia_IR and Nokia Infrared) supplied with 10.1 don't seem to work (I'm currently on 10.1.3 and this hasn't been corrected yet). However the OS 9 scripts seem to work (I'm on 9.2.2) so I simply replaced the "Nokia Infrared" script in "Library/Modem Scripts" with the one in "System Folder/Extensions/Modem Scripts".
Even though the scripts are marked as the same version, when compared in BBEdit, there are some differences, including one to the modem initialization string.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020306201859628